summaryrefslogtreecommitdiffstats
path: root/drivers/iommu/amd_iommu_init.c
diff options
context:
space:
mode:
authorJoerg Roedel <joro@8bytes.org>2013-04-09 16:35:28 +0200
committerJoerg Roedel <joro@8bytes.org>2013-04-19 20:52:17 +0200
commit440e899805411d827d4fcce9eb37bf2417c812db (patch)
tree0316e0431180fd838a4ad02b22873a1ca2c0c452 /drivers/iommu/amd_iommu_init.c
parent235dacbc795bb7ccf69db8ad9ff1587314cf857d (diff)
downloadlinux-440e899805411d827d4fcce9eb37bf2417c812db.tar.bz2
iommu/amd: Add ioapic and hpet ivrs override
Add two new kernel commandline parameters ivrs_ioapic and ivrs_hpet to override the Id->DeviceId mapping from the IVRS ACPI table. This can be used to work around broken BIOSes to get interrupt remapping working on AMD systems. Tested-by: Borislav Petkov <bp@suse.de> Tested-by: Suravee Suthikulanit <suravee.suthikulpanit@amd.com> Reviewed-by: Shuah Khan <shuahkhan@gmail.com> Signed-off-by: Joerg Roedel <joro@8bytes.org>
Diffstat (limited to 'drivers/iommu/amd_iommu_init.c')
-rw-r--r--drivers/iommu/amd_iommu_init.c64
1 files changed, 62 insertions, 2 deletions
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index 2a3b1b174d5e..030d6abf31e7 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -2145,8 +2145,68 @@ static int __init parse_amd_iommu_options(char *str)
return 1;
}
-__setup("amd_iommu_dump", parse_amd_iommu_dump);
-__setup("amd_iommu=", parse_amd_iommu_options);
+static int __init parse_ivrs_ioapic(char *str)
+{
+ unsigned int bus, dev, fn;
+ int ret, id, i;
+ u16 devid;
+
+ ret = sscanf(str, "[%d]=%x:%x.%x", &id, &bus, &dev, &fn);
+
+ if (ret != 4) {
+ pr_err("AMD-Vi: Invalid command line: ivrs_ioapic%s\n", str);
+ return 1;
+ }
+
+ if (early_ioapic_map_size == EARLY_MAP_SIZE) {
+ pr_err("AMD-Vi: Early IOAPIC map overflow - ignoring ivrs_ioapic%s\n",
+ str);
+ return 1;
+ }
+
+ devid = ((bus & 0xff) << 8) | ((dev & 0x1f) << 3) | (fn & 0x7);
+
+ i = early_ioapic_map_size++;
+ early_ioapic_map[i].id = id;
+ early_ioapic_map[i].devid = devid;
+ early_ioapic_map[i].cmd_line = true;
+
+ return 1;
+}
+
+static int __init parse_ivrs_hpet(char *str)
+{
+ unsigned int bus, dev, fn;
+ int ret, id, i;
+ u16 devid;
+
+ ret = sscanf(str, "[%d]=%x:%x.%x", &id, &bus, &dev, &fn);
+
+ if (ret != 4) {
+ pr_err("AMD-Vi: Invalid command line: ivrs_hpet%s\n", str);
+ return 1;
+ }
+
+ if (early_hpet_map_size == EARLY_MAP_SIZE) {
+ pr_err("AMD-Vi: Early HPET map overflow - ignoring ivrs_hpet%s\n",
+ str);
+ return 1;
+ }
+
+ devid = ((bus & 0xff) << 8) | ((dev & 0x1f) << 3) | (fn & 0x7);
+
+ i = early_hpet_map_size++;
+ early_hpet_map[i].id = id;
+ early_hpet_map[i].devid = devid;
+ early_hpet_map[i].cmd_line = true;
+
+ return 1;
+}
+
+__setup("amd_iommu_dump", parse_amd_iommu_dump);
+__setup("amd_iommu=", parse_amd_iommu_options);
+__setup("ivrs_ioapic", parse_ivrs_ioapic);
+__setup("ivrs_hpet", parse_ivrs_hpet);
IOMMU_INIT_FINISH(amd_iommu_detect,
gart_iommu_hole_init,